Article(id=1192850381337150331, tenantId=1146029695717560320, journalId=1189987059142926344, issueId=1190985985849705466, articleNumber=null, orderNo=null, doi=10.19457/j.1001-2095.dqcd25484, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1699804800000, receivedDateStr=2023-11-13, revisedDate=1703952000000, revisedDateStr=2023-12-31, acceptedDate=null, acceptedDateStr=null, onlineDate=1762327292998, onlineDateStr=2025-11-05, pubDate=1747670400000, pubDateStr=2025-05-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762327292998, onlineIssueDateStr=2025-11-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762327292998, creator=13701087609, updateTime=1762327292998, updator=13701087609, issue=Issue{id=1190985985849705466, tenantId=1146029695717560320, journalId=1189987059142926344, year='2025', volume='55', issue='5', pageStart='3', pageEnd='96', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1761882786476, creator=13701087609, updateTime=1762390467120, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1193115352897909350, tenantId=1146029695717560320, journalId=1189987059142926344, issueId=1190985985849705466, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1193115352897909351, tenantId=1146029695717560320, journalId=1189987059142926344, issueId=1190985985849705466, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=79, endPage=88, ext={EN=ArticleExt(id=1192850381517505404, articleId=1192850381337150331, tenantId=1146029695717560320, journalId=1189987059142926344, language=EN, title=A Fuzzy Comprehensive Judgment Method for Transformer State Based on Game Theory and Improved D-S Evidence Theory, columnId=null, journalTitle=Electric Drive, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the complexities of transformer condition assessment indicators and the overreliance on expert judgment in the evaluation process,a novel method for fuzzy comprehensive assessment of transformer condition was introduced,which is based on gaming theory and an improved version of the D-S evidence theory. First,the analytic hierarchy process (AHP) and the Critic method was adopted to determine both the subjective and objective weights of the evaluation indicators. These weights are then combined using game theory,reducing the dependence on expert opinions in traditional weight determination methods. Second,instead of traditional membership functions,cloud models was employed to preserve the inherent uncertainty in fuzzy assessments. Finally,membership information at the project level was fused by using improved D-S evidence,eliminating paradoxical results that can occur when combining high-conflict evidence. Through the results of case studies,the method effectively assesses the transition probabilities of various transformer states.

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针对变压器状态评价指标复杂和评价过程过于依赖专家经验的问题,提出了一种基于博弈论和改进D-S证据理论的变压器状态模糊综合评判方法。首先,采用层次分析法和Critic方法分别计算指标的主客观权重,通过博弈论方法得到组合权重,克服传统权重方法过于依赖专家经验的问题。其次,使用云模型代替传统的隶属函数方法,保留了模糊评价中的不确定性。最后,通过改进D-S证据理论将项目层隶属度信息进行融合,消除D-S证据理论在高冲突证据融合时结果与常理相悖的现象。通过实例分析得出,该方法能够有效地评判变压器各状态转化概率。

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熊伟(1976—),男,博士,高级工程师,主要研究方向为深度学习、故障诊断,Email:

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熊伟(1976—),男,博士,高级工程师,主要研究方向为深度学习、故障诊断,Email:

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Rules for comparing the importance of elements

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因素1与因素2相比 量化值
同等重要 1
稍微重要 3
较强重要 5
强烈重要 7
极端重要 9
较强重要 5
两相邻判断的中间值 2,4,6,8
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元素重要程度比较规则

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因素1与因素2相比 量化值
同等重要 1
稍微重要 3
较强重要 5
强烈重要 7
极端重要 9
较强重要 5
两相邻判断的中间值 2,4,6,8
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Average random consistency index

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阶数n RI 阶数n RI
1 0 6 1.26
2 0 7 1.36
3 0.52 8 1.41
4 0.89 9 1.46
5 1.12 10 1.49
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平均随机一致性指标

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阶数n RI 阶数n RI
1 0 6 1.26
2 0 7 1.36
3 0.52 8 1.41
4 0.89 9 1.46
5 1.12 10 1.49
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Relationship between transformer condition and relative deterioration index values

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变压器状态 相对劣化度
正常状态 0~0.2
注意状态 0.2~0.4
异常状态 0.4~0.7
严重状态 0.7~1.0
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变压器状态与指标相对劣化度值的关系

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变压器状态 相对劣化度
正常状态 0~0.2
注意状态 0.2~0.4
异常状态 0.4~0.7
严重状态 0.7~1.0
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Cloud model numerical features

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变压器状态 云模型数字特征(ExEnHe
正常状态 (0.1,0.085,0.003)
注意状态 (0.3,0.085,0.003)
异常状态 (0.55,0.127,0.005)
严重状态 (0.85,0.127,0.005)
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云模型数字特征

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变压器状态 云模型数字特征(ExEnHe
正常状态 (0.1,0.085,0.003)
注意状态 (0.3,0.085,0.003)
异常状态 (0.55,0.127,0.005)
严重状态 (0.85,0.127,0.005)
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Transformer evaluation indicator weights

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主观权重(m1 客观权重(m2 组合权重(m
0.059 7 0.095 6 0.066 4
0.119 4 0.089 2 0.113 7
0.089 6 0.078 7 0.087 5
0.134 3 0.092 3 0.126 4
0.089 6 0.119 5 0.095 2
0.089 6 0.065 2 0.085 0
0.149 3 0.095 4 0.139 2
0.089 6 0.105 2 0.092 5
0.059 7 0.075 9 0.062 7
0.089 6 0.079 8 0.087 7
0.029 9 0.103 2 0.043 7
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变压器评价指标权重

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主观权重(m1 客观权重(m2 组合权重(m
0.059 7 0.095 6 0.066 4
0.119 4 0.089 2 0.113 7
0.089 6 0.078 7 0.087 5
0.134 3 0.092 3 0.126 4
0.089 6 0.119 5 0.095 2
0.089 6 0.065 2 0.085 0
0.149 3 0.095 4 0.139 2
0.089 6 0.105 2 0.092 5
0.059 7 0.075 9 0.062 7
0.089 6 0.079 8 0.087 7
0.029 9 0.103 2 0.043 7
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Distribution of evaluation indicator memberships

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指标 v1 v2 v3 v4
I1 0.701 9 0.282 1 0.016 0 0
I2 1 0 0 0
I3 0 0.106 0 0.894 0 0
I4 0 0.344 6 0.655 4 0
I5 0 0 0.228 0 0.772 0
I6 0.118 7 0.807 2 0.074 1 0
I7 0.313 5 0.686 5 0 0
I8 0 0 0 1
I9 0 0.514 0 0.486 0 0
I10 0 0.697 2 0.302 8 0
I11 0 0.628 0 0.372 0 0
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评价指标隶属度分布

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指标 v1 v2 v3 v4
I1 0.701 9 0.282 1 0.016 0 0
I2 1 0 0 0
I3 0 0.106 0 0.894 0 0
I4 0 0.344 6 0.655 4 0
I5 0 0 0.228 0 0.772 0
I6 0.118 7 0.807 2 0.074 1 0
I7 0.313 5 0.686 5 0 0
I8 0 0 0 1
I9 0 0.514 0 0.486 0 0
I10 0 0.697 2 0.302 8 0
I11 0 0.628 0 0.372 0 0
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Project-level memberships

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证据 v1 v2 v3 v4
M1 0.407 0 0.181 6 0.411 4 0
M2 0.130 4 0.398 5 0.068 0 0.403 1
M3 0 0.622 4 0.377 6 0
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项目层隶属度

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证据 v1 v2 v3 v4
M1 0.407 0 0.181 6 0.411 4 0
M2 0.130 4 0.398 5 0.068 0 0.403 1
M3 0 0.622 4 0.377 6 0
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Revised basic probability of evidence

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证据 m(Θ) v1 v2 v3 v4
M1* 0.701 2 0.121 6 0.054 3 0.122 9 0
M2* 0 0.130 4 0.398 5 0.068 0 0.403 1
M3* 0 0 0.622 4 0.377 6 0
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修正后的证据基本概率

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证据 m(Θ) v1 v2 v3 v4
M1* 0.701 2 0.121 6 0.054 3 0.122 9 0
M2* 0 0.130 4 0.398 5 0.068 0 0.403 1
M3* 0 0 0.622 4 0.377 6 0
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Transformer evaluation results

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变压器编号 v1 v2 v3 v4 实际状态 模糊综合评价法 文献[30] 本文方法
1 0.595 2 0.368 5 0.036 4 0 正常 注意 注意 正常
2 0.924 9 0 0.059 1 0.015 8 正常 正常 正常 正常
3 0.116 0.617 8 0.129 5 0.136 6 注意 注意 注意 注意
4 0.832 9 0.005 0.162 1 0 正常 正常 正常 正常
5 0.887 7 0.112 3 0 0 正常 正常 正常 正常
6 0.664 4 0.005 1 0.329 2 0.001 1 正常 正常 正常 正常
7 0.968 2 0 0.031 3 0 正常 正常 正常 正常
8 1.000 2 0 0 0 正常 正常 正常 正常
9 0 0 0.913 4 0.086 6 异常 异常 异常 异常
10 0.032 7 0.760 1 0.115 7 0.091 5 注意 注意 注意 注意
11 0 0 0 1 严重 严重 严重 严重
12 0.264 2 0.555 4 0.077 2 0.103 2 注意 注意 注意 注意
13 0 0.001 7 0.925 2 0.073 3 异常 异常 异常 异常
14 0.847 5 0.037 5 0.115 0 正常 正常 正常 正常
15 0.469 6 0.512 7 0.017 7 0 正常 注意 注意 注意
16 0.252 3 0.014 7 0.035 9 0.697 7 严重 异常 正常 严重
17 0.941 5 0 0.058 9 0 正常 正常 正常 正常
18 0.061 6 0.024 8 0.730 2 0.183 4 异常 异常 异常 异常
19 0 0 1 0 异常 异常 异常 异常
20 0 0.302 9 0.697 1 0 异常 注意 注意 异常
21 0.520 2 0.172 5 0.307 3 0 正常 注意 注意 正常
22 0.233 1 0.547 4 0.092 4 0.127 1 注意 注意 注意 注意
23 0.026 1 0 0.008 1 0.965 9 严重 严重 严重 严重
24 0.023 6 0.507 0.055 9 0.413 5 注意 注意 注意 注意
25 0.140 8 0.851 6 0.007 9 0 注意 注意 注意 注意
26 0.950 1 0.041 2 0.008 6 0 正常 正常 正常 正常
27 1 0 0 0 正常 正常 正常 正常
28 0 0.009 4 0.474 8 0.515 8 异常 异常 异常 严重
29 0.714 6 0.073 0.211 3 0 正常 正常 注意 正常
30 0.440 1 0.149 3 0.410 5 0 正常 注意 注意 正常
31 0.168 1 0.476 1 0.110 5 0.245 3 注意 注意 注意 注意
32 0 0 0 1 严重 严重 严重 严重
33 0.819 2 0.180 8 0 0 正常 注意 正常 正常
34 0 0 0.949 7 0.050 3 异常 异常 异常 异常
35 0.667 9 0.167 8 0.164 6 0 正常 正常 正常 正常
36 0.275 7 0.359 0.362 1 0.003 3 异常 注意 注意 异常
37 0.717 6 0.282 8 0 0 正常 正常 正常 正常
38 0.999 8 0 0 0 正常 正常 正常 正常
39 0.113 5 0.497 4 0.104 0.285 注意 注意 注意 注意
40 0.358 9 0 0.010 8 0.630 4 严重 正常 正常 严重
41 0.157 2 0.498 7 0.217 5 0.126 6 注意 异常 异常 注意
42 0.009 5 0.840 4 0.044 4 0.105 8 注意 注意 注意 注意
43 0.098 5 0 0.000 5 0.901 严重 严重 严重 严重
44 0 0 0.770 9 0.229 1 异常 注意 异常 异常
45 0.019 3 0.875 2 0.006 9 0.098 6 注意 注意 注意 注意
46 0 0 0.998 4 0.001 6 异常 异常 异常 异常
47 0.023 2 0.502 4 0.069 8 0.404 6 注意 注意 注意 注意
48 0.806 5 0.091 3 0.102 2 0 正常 正常 正常 正常
49 0.696 0.005 8 0.298 5 0 正常 正常 正常 正常
50 0 0 0.031 2 0.968 8 严重 严重 严重 严重
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变压器评价结果

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变压器编号 v1 v2 v3 v4 实际状态 模糊综合评价法 文献[30] 本文方法
1 0.595 2 0.368 5 0.036 4 0 正常 注意 注意 正常
2 0.924 9 0 0.059 1 0.015 8 正常 正常 正常 正常
3 0.116 0.617 8 0.129 5 0.136 6 注意 注意 注意 注意
4 0.832 9 0.005 0.162 1 0 正常 正常 正常 正常
5 0.887 7 0.112 3 0 0 正常 正常 正常 正常
6 0.664 4 0.005 1 0.329 2 0.001 1 正常 正常 正常 正常
7 0.968 2 0 0.031 3 0 正常 正常 正常 正常
8 1.000 2 0 0 0 正常 正常 正常 正常
9 0 0 0.913 4 0.086 6 异常 异常 异常 异常
10 0.032 7 0.760 1 0.115 7 0.091 5 注意 注意 注意 注意
11 0 0 0 1 严重 严重 严重 严重
12 0.264 2 0.555 4 0.077 2 0.103 2 注意 注意 注意 注意
13 0 0.001 7 0.925 2 0.073 3 异常 异常 异常 异常
14 0.847 5 0.037 5 0.115 0 正常 正常 正常 正常
15 0.469 6 0.512 7 0.017 7 0 正常 注意 注意 注意
16 0.252 3 0.014 7 0.035 9 0.697 7 严重 异常 正常 严重
17 0.941 5 0 0.058 9 0 正常 正常 正常 正常
18 0.061 6 0.024 8 0.730 2 0.183 4 异常 异常 异常 异常
19 0 0 1 0 异常 异常 异常 异常
20 0 0.302 9 0.697 1 0 异常 注意 注意 异常
21 0.520 2 0.172 5 0.307 3 0 正常 注意 注意 正常
22 0.233 1 0.547 4 0.092 4 0.127 1 注意 注意 注意 注意
23 0.026 1 0 0.008 1 0.965 9 严重 严重 严重 严重
24 0.023 6 0.507 0.055 9 0.413 5 注意 注意 注意 注意
25 0.140 8 0.851 6 0.007 9 0 注意 注意 注意 注意
26 0.950 1 0.041 2 0.008 6 0 正常 正常 正常 正常
27 1 0 0 0 正常 正常 正常 正常
28 0 0.009 4 0.474 8 0.515 8 异常 异常 异常 严重
29 0.714 6 0.073 0.211 3 0 正常 正常 注意 正常
30 0.440 1 0.149 3 0.410 5 0 正常 注意 注意 正常
31 0.168 1 0.476 1 0.110 5 0.245 3 注意 注意 注意 注意
32 0 0 0 1 严重 严重 严重 严重
33 0.819 2 0.180 8 0 0 正常 注意 正常 正常
34 0 0 0.949 7 0.050 3 异常 异常 异常 异常
35 0.667 9 0.167 8 0.164 6 0 正常 正常 正常 正常
36 0.275 7 0.359 0.362 1 0.003 3 异常 注意 注意 异常
37 0.717 6 0.282 8 0 0 正常 正常 正常 正常
38 0.999 8 0 0 0 正常 正常 正常 正常
39 0.113 5 0.497 4 0.104 0.285 注意 注意 注意 注意
40 0.358 9 0 0.010 8 0.630 4 严重 正常 正常 严重
41 0.157 2 0.498 7 0.217 5 0.126 6 注意 异常 异常 注意
42 0.009 5 0.840 4 0.044 4 0.105 8 注意 注意 注意 注意
43 0.098 5 0 0.000 5 0.901 严重 严重 严重 严重
44 0 0 0.770 9 0.229 1 异常 注意 异常 异常
45 0.019 3 0.875 2 0.006 9 0.098 6 注意 注意 注意 注意
46 0 0 0.998 4 0.001 6 异常 异常 异常 异常
47 0.023 2 0.502 4 0.069 8 0.404 6 注意 注意 注意 注意
48 0.806 5 0.091 3 0.102 2 0 正常 正常 正常 正常
49 0.696 0.005 8 0.298 5 0 正常 正常 正常 正常
50 0 0 0.031 2 0.968 8 严重 严重 严重 严重
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基于博弈论和改进D-S证据理论的变压器状态模糊综合评判方法
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熊伟 1 , 陈龙 2 , 吕顺利 2 , 郭振宇 3 , 路鑫 1
电气传动 | 可靠性与诊断 2025,55(5): 79-88
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电气传动 | 可靠性与诊断 2025, 55(5): 79-88
基于博弈论和改进D-S证据理论的变压器状态模糊综合评判方法
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熊伟1 , 陈龙2, 吕顺利2, 郭振宇3, 路鑫1
作者信息
  • 1 华北电力大学 计算机系,河北 保定 071003
  • 2 国网电力科学研究院有限公司,江苏 南京 210003
  • 3 国网安徽省电力有限公司超高压分公司,安徽 合肥 230041
  • 熊伟(1976—),男,博士,高级工程师,主要研究方向为深度学习、故障诊断,Email:

A Fuzzy Comprehensive Judgment Method for Transformer State Based on Game Theory and Improved D-S Evidence Theory
Wei XIONG1 , Long CHEN2, Shunli LÜ2, Zhenyu GUO3, Xin LU1
Affiliations
  • 1 Computer Department,North China Electric Power University,Baoding 071003,Hebei,China
  • 2 State Grid Electric Power Research Institute,Nanjing 210003,Jiangsu,China
  • 3 State Grid Anhui Ultra High Voltage Company,Hefei 230041,Anhui,China
出版时间: 2025-05-20 doi: 10.19457/j.1001-2095.dqcd25484
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针对变压器状态评价指标复杂和评价过程过于依赖专家经验的问题,提出了一种基于博弈论和改进D-S证据理论的变压器状态模糊综合评判方法。首先,采用层次分析法和Critic方法分别计算指标的主客观权重,通过博弈论方法得到组合权重,克服传统权重方法过于依赖专家经验的问题。其次,使用云模型代替传统的隶属函数方法,保留了模糊评价中的不确定性。最后,通过改进D-S证据理论将项目层隶属度信息进行融合,消除D-S证据理论在高冲突证据融合时结果与常理相悖的现象。通过实例分析得出,该方法能够有效地评判变压器各状态转化概率。

电力变压器  /  多级模糊综合评判  /  Critic方法  /  博弈论  /  改进D-S证据理论

To address the complexities of transformer condition assessment indicators and the overreliance on expert judgment in the evaluation process,a novel method for fuzzy comprehensive assessment of transformer condition was introduced,which is based on gaming theory and an improved version of the D-S evidence theory. First,the analytic hierarchy process (AHP) and the Critic method was adopted to determine both the subjective and objective weights of the evaluation indicators. These weights are then combined using game theory,reducing the dependence on expert opinions in traditional weight determination methods. Second,instead of traditional membership functions,cloud models was employed to preserve the inherent uncertainty in fuzzy assessments. Finally,membership information at the project level was fused by using improved D-S evidence,eliminating paradoxical results that can occur when combining high-conflict evidence. Through the results of case studies,the method effectively assesses the transition probabilities of various transformer states.

power transformer  /  multilevel fuzzy comprehensive judgment  /  Critic method  /  game theory  /  improved D-S evidence theory
熊伟, 陈龙, 吕顺利, 郭振宇, 路鑫. 基于博弈论和改进D-S证据理论的变压器状态模糊综合评判方法. 电气传动, 2025 , 55 (5) : 79 -88 . DOI: 10.19457/j.1001-2095.dqcd25484
Wei XIONG, Long CHEN, Shunli LÜ, Zhenyu GUO, Xin LU. A Fuzzy Comprehensive Judgment Method for Transformer State Based on Game Theory and Improved D-S Evidence Theory[J]. Electric Drive, 2025 , 55 (5) : 79 -88 . DOI: 10.19457/j.1001-2095.dqcd25484
变压器作为电力系统的关键组件之一,其运行状态的好坏决定了电力系统的整体运行性能[1]。因此,变压器状态的准确评估对于确保电力系统的可靠性、稳定性以及效率至关重要。准确的变压器状态评估不仅可以延长变压器的使用寿命,降低设备维护成本,还能够及早识别潜在的安全风险,从而提高电力系统整体的稳定性和运行效率。
鉴于变压器在电力系统中的关键作用和运行状态对整个系统的影响,近几年来许多致力于准确评估和监测变压器健康状态状况的论文被提出。杜江等人[2]采用变权灰云模型对变压器状态进行评估,充分考虑信息的模糊性和随机性,但变权均衡系数的确定依赖于主观判断。夏彦卫等人[3]提出了一种基于模糊评判与DSmT变压器绝缘状态评价方法,能够反映变压器的绝缘状态等级和绝缘缺陷风险趋势,但在融合指标隶属度时,忽略了确定概念的随机性。张梦瑶等人[4]基于灰色物元处理变压器评估指标,实现对变压器状态的定性和定量评估,但在确定评价指标权重时结合两种客观权重方法,忽略专家经验。王骏等人[5]提出了一种基于权重博弈论与证据理论相结合的变压器状态评价模型,在考虑专家的经验和大量历史客观数据前提下,使用博弈论得到的综合权重,能有效解决指标之间的冲突,但采用指派法确定变压器状态的隶属度,没有很好地考虑到运行状态的随机性。张冀等人[6]建立了基于差异化阈值的变压器特征参量状态隶属函数,通过层次分析法和熵值法的博弈论加权计算不同运行状态的置信概率,但在计算指标权重时,忽略了指标之间的关联性,导致指标信息的重叠。周剑等人[7]采用博弈论方法将层次分析法、变异系数法、组合赋权法得到的权重值进行博弈妥协处理,将最优指标值和最优权重值进行线性叠加得到变压器评价结果。张珂斐等人[8]提出了一种基于最优权重和模糊综合分析法的变压器状态评价方法,结合层次分析法和熵权法计算指标权重,但在采用D-S证据理论融合证据信息时,没有考虑到高冲突证据融合相悖的问题。石宜金等人[9]提出了一种改进D-S证据理论的变压器状态模糊综合评估方法,采用相关系数对证据源信息进行修正,但修正后不能保证证据信息的和值为1,且在衡量评价指标权重时仅使用层次分析法,过于依赖专家经验。此外,随着机器学习和深度学习的快速发展,一些学者开始在变压器状态评估领域探索并引入新的方法,包括支持向量机[10]、集成学习[11]、贝叶斯网络[12]、深度信念网络[13]以及深度神经网络[14]等先进技术。然而,这些方法通常需要大规模的数据支持,对数据质量要求较高,导致难以应用到实际场景中。
针对以上方法的不足,本文提出一种基于合作博弈和改进D-S证据理论的变压器状态模糊综合评判方法。该方法综合了博弈论、云模型和改进的D-S证据理论的优点,能够有效评判变压器状态。
本文主要的改进点如下:使用博弈论结合主客观权重得到组合权重;采用相对劣化度和由云模型得到的隶属函数为变压器指标进行赋值;选择改进的D-S证据理论得到评判结果。
结合DL/T 1685-2017油浸式变压器(电抗器)状态评价导则,选取重要状态参量作为变压器状态评价指标,如图1所示。变压器状态评价体系由目标层、项目层、指标层构成。
本文电力变压器状态评判结果分为4个等级,即{正常,注意,异常,严重},对应的评语集表示为V={v1v2v3v4}。
本节将介绍变压器状态评估过程的3个步骤。首先,结合专家经验采用层次分析法计算指标的主观权重,考虑到指标数据之间的关联性,使用Critic方法计算指标的客观权重,并利用博弈论的思想,找到二者的均衡点,形成主客观融合的组合权重。其次,采用相对劣化度消除指标本身性质、物理意义以及量纲的影响,采用云模型来描述某一元素对于指定模糊集合的隶属度。最后通过改进D-S证据理论将隶属度信息进行融合,从而对变压器状态进行评判,评判过程流程如图2所示。
主观权重是指通过互相比较的方式确定各指标的相对重要性,专家打分来确定各个指标的权重,易受主观因素的影响。客观权重是指从实际的数据出发,忽略人为因素的干预,通过数学理论来获取各个指标的权重,缺乏专家经验在某些定性指标的作用。因此本文采用层次分析法和Critic方法分别计算图1中评价指标主观权重和客观权重,使用博弈论将专家经验与客观运行情况相结合,更加准确地反映变压器实际情况,权重融合过程如图3所示。
层次分析法是一项用来解决多目标、多层次且难以完全用定量的方法去解决的主观赋权法[15]。基于层次分析法计算主观权重的步骤如下:
1)基于专家经验构造判断矩阵[16]。专家根据给定的重要程度比较规则,如表1所示,对隶属于同一指标下的元素进行两两比较,构建判断矩阵。
2)基于特征根法计算判断矩阵的特征值和特征向量。判断矩阵最大特征值对应的特征向量是该层元素的权重值。
3)一致性检验。为保证矩阵各项关系保持逻辑上的合理通顺,避免出现不一致现象,需对判断矩阵进行一致性检验。需要满足一致性比例CR=CI/RI0.1,则认为判断矩阵的一致性可以接受。其中,RI值由表2规定,CI计算如下式:
$CI=\frac{{\lambda }_{max}-n}{n-1}$
式中:λmax为判断矩阵的最大特征值;n为矩阵的阶数。
Critic方法是一种基于数据对比强度和数据间冲突性的客观权重赋权法[17]。基于Critic方法计算客观权重的步骤如下:
1)构建m×n阶评价指标矩阵:
$X=\left[\begin{array}{cccc}{x}_{11}& {x}_{12}& \cdots & {x}_{1n}\\ {x}_{21}& {x}_{22}& \cdots & {x}_{2n}\\ ⋮& ⋮& & ⋮\\ {x}_{m1}& {x}_{m2}& \cdots & {x}_{mn}\end{array}\right]$
式中:m为评价对象的个数;n为评价指标的个数。
2)为了消除指标之间的量纲和取值范围的差异,对指标数据进行归一化处理。由于指标间的作用性质不同,将指标规划为正向指标和负向指标两大类[18]。其中,正向指标代表评价对象的优良指标,其数值越大越好,使用下式对其归一化:
${y}_{ij}=\frac{{x}_{ij}-min\left({x}_{j}\right)}{max\left({x}_{j}\right)-min\left({x}_{j}\right)}$
式中:xij为第i个评价对象的第j个评价指标值;xj为评价指标矩阵中第j列所有评价指标。
负向指标代表评价对象的劣质指标,其数值越小越好,使用下式对其归一化:
${y}_{ij}=\frac{max\left({x}_{j}\right)-{x}_{ij}}{max\left({x}_{j}\right)-min\left({x}_{j}\right)}$
3)计算指标Ij的客观权重:
${\mu }_{j}=\frac{{c}_{j}}{\sum _{j=1}^{n}{c}_{j}}$
其中
${c}_{j}={\sigma }_{j}\sum _{h=1}^{n}(1-{\rho }_{jh})$
式中:cj为指标的信息量,信息量越大,该指标所占权重就越大;σj为指标Ij的标准差;ρjh为指标Ij与指标Ih的相关系数,Ih为第h列指标,是除被计算权重的指标以外的任意指标。
为了避免单一权重计算方法的缺陷,同时排除常权法、变权法[19]等得到组合权重方法过于依赖主观人为因素的影响。本文通过引入博弈组合赋权方法,结合主观权重和客观权重各自的优点,寻找最优权重。博弈组合赋权以博弈论的思想为基础,将主观权重和客观权重当作博弈参与者[20],使组合权重与各方法所得权重的离差最小,从而双方达到一致或妥协[21]。基于博弈论进行组合赋权的步骤如下:
1)设共有m种方法(本文m=2)对权重进行赋值,赋值所得权重向量计为ωi,对不同方法所得权重向量ωi进行任意线性组合,形成组合权重,得出的线性组合表达式为
$\omega =\sum _{i=1}^{m}{\beta }_{i}\cdot {\omega }_{i}^{T}    {\beta }_{i}0,\sum _{i=1}^{m}{\beta }_{i}=1$
式中:βi为线性相关系数,也为权重系数。
2)为求得最优权重ω*,以ωiωj离差最小化为目标,建立博弈对策模型为
$min\left|\right|\sum _{i=1}^{m}{\beta }_{i}\cdot {\omega }_{i}^{T}-{\omega }_{j}^{T}|{|}_{2}    j=\mathrm{1,2},\cdots,m$
3)求得权重系数$({\beta }_{1}, {\beta }_{2}, \dots, {\beta }_{i})$后,计算出组合权重:
${\omega }_{}^{*}=\sum _{i=1}^{m}{\beta }_{i}^{*}\cdot {\omega }_{i}^{T}$
其中
${\beta }_{i}^{}=\frac{{\beta }_{i}^{}}{\sum _{i=1}^{m}{\beta }_{i}^{}}$
式中:${\beta }_{i}^{*}$为对权重系数进行归一化处理的结果。
相对劣化度常用来衡量当前状态指标数值与标准数值相比的变化程度,它可以消除指标本身性质、物理意义以及量纲的影响[22],取值区间在[0,1]之间。
对于取值越大越优秀的指标,其相对劣化度公式为
$u_{1}(x)=\left\{\begin{array}{ll}1 & x<x_{\min } \\\frac{x_{\max }-x}{x_{\max }-x_{\min }} & x_{\min } \leqslant x \leqslant x_{\max } \\0 & x>x_{\max }\end{array}\right.$
对于取值越小越优秀的指标,其相对劣化度公式为
$u_{2}(x)=\left\{\begin{array}{ll}0 & x<x_{\min } \\\frac{x-x_{\min }}{x_{\max }-x_{\min }} & x_{\min } \leqslant x \leqslant x_{\max } \\1 & x>x_{\max }\end{array}\right.$
式中:u(x)为相对劣化度;x为评价指标当前数值;xmaxxmin分别为评价指标的上、下限值。
隶属函数常用来描述某一元素对于指定模糊集合的隶属度,将该元素映射成[0,1]之间的实数,实数越大,则表示隶属度越高[23]。确定隶属函数的常见方法包括模糊统计法、借用已有的客观尺度以及指派法[24],在变压器的综合评价中,通常采用指派法,将已有的函数作为隶属函数,在指标数值和隶属度之间建立确定的映射。但实际的变压器系统在不同工况下性能特点可能发生变化,采用确定的映射关系可能使运行状态之间转化的复杂性和随机性被忽略,导致评价结果过度简化。
为了克服以上问题,本文采用具有模糊性和不确定性特点的云模型,代替隶属函数计算隶属度,并定义模糊集合为{正常,注意,异常,严重},实现定性概念向具体数值的转换。
云模型包括期望、熵、超熵共3个数字特征。分别为:代表定性概念的中间值Ex、用来反映定性概念的不确定性En、用来表示熵的不确定性He。云模型常用的是正态云发生器,分为正向云发生器和逆向云发生器。其中正向云发生器用来将定性概念转为具体数值,生成评价云滴。算法如下:生成随机数${E}_{n}^{*}$,且${E}_{n}^{*}~N({E}_{n},{H}_{e}^{2})$;生成随机数x,且$x~N({E}_{x},{E}_{n}^{*2})$;求云滴e的位置$[x, \mu (x\left)\right]$,其中$\mu \left(x\right)=exp[-(x-{E}_{x}{)}^{2}/2\left({E}_{n}^{*}{)}^{2}\right]$
在确定云模型所需的数字特征[25]时,往往需要针对不同数据生成不同的云模型,所需数据量大,且步骤繁琐,本文基于文献[26]提出的云模型数字特征计算方法进行改进。设评判区间C的上、下阈值为CmaxCmin,使用评判区间上、下阈值的中间值代表Ex,即Ex=(Cmax+Cmin)/2;对于评判区间的临界值来说,它是一个模糊边界,应同时属于左、右两个区间,且隶属度相等,因此有exp[-(x-Ex)2/2(En)2]=0.5,取x=CmaxCmin,代入Ex=(Cmax+Cmin)/2,得En=(Cmax-Cmin)/2.355。HeEn不确定性的度量,反映了系统的稳定度,其值越大,系统越不稳定。在考虑不确定性的同时,为了维持云模型的稳定,一般将He设置在0.001到0.01之间。本文将He设置为0.005。
变压器状态等级与评估指标的相对劣化度值的关系[27]表3所示。
因此,各变压器状态等级所对应的云模型数字特征如表4所示,云模型如图4所示。在取指标相对劣化度对应的隶属度值时,对于不同状态等级的云模型,按照相对劣化度的升序对云滴进行排序,取相对劣化度u周围共5个云滴的均值作为其隶属度值的值。
图4的云模型图所示,当相对劣化度0u0.1时,正常状态的隶属度不断增高;当相对劣化度u0.85时,严重状态的隶属度开始下降,不符合现实情况。因此,定义0u0.1时,正常状态的隶属度值为1,u0.85时,严重状态的隶属度值为1。由此可以得到修改后的云模型图如图5所示。
D-S证据理论是一种有效的不确定性推理方法,其主要优势在于能够融合来自多个不同证据源的信息,以减少不确定性,从而生成更加可靠的结论[28]。这一理论目前在数据融合、决策分析等多个领域取得广泛应用[29]
D-S证据理论的一般规则为
$m\left(A\right)=\frac{\sum _{}{}_{{A}_{i}\bigcap {A}_{j}=A}\left\{{m}_{1}\left({A}_{i}\right){m}_{2}\left({A}_{j}\right)\right\}}{1-K}$
其中
$K=\sum _{}{}_{{A}_{i}\bigcap {A}_{j}=\varnothing }\left\{{m}_{1}\left({A}_{i}\right){m}_{2}\left({A}_{j}\right)\right\}$
式中:m1(Ai),m2(Aj)分别为AiAj的基本可信度函数。
在实际应用中,多个证据源提供的证据信息会有冲突,在对高冲突的证据信息进行融合后,所得到的结果往往与常理相悖。但绝大多数证据信息是可靠的,导致此问题的原因往往是个别证据信息异常[30]。因此,本文基于皮尔逊相关系数对D-S 证据理论进行改进,找出高冲突证据信息,并对其修正。假设共有N个证据源,证据信息的长度为n,具体步骤如下:
1)计算证据信息mimj之间的皮尔逊相关系数为
${R}_{ij}=\frac{\sum _{k=1}^{n}\left[{m}_{i}\right({A}_{k})-\overline{{m}_{i}\left(A\right)}]\left[{m}_{j}\right({A}_{k})-\overline{{m}_{j}\left(A\right)}]}{\sqrt{\sum _{k=1}^{n}\left[{m}_{i}\right({A}_{k}{)-\overline{{m}_{i}\left(A\right)}]}^{2}}\sqrt{\sum _{k=1}^{n}\left[{m}_{j}\right({A}_{k}{)-\overline{{m}_{j}\left(A\right)}]}^{2}}}$
Rij的范围为[-1,1],其值越大,说明证据间的冲突性越小。为了避免计算平均相关度时,相关系数数值相互抵消,使${R}_{ij}^{*}={R}_{ij}+1$
2)证据mi与其他证据的平均相关度为
${R}_{i}^{*}=\frac{1}{N-1}\sum _{j=1,i\ne j}^{N}{R}_{ij}^{*}$
3)引入相对劣化度的思想对证据之间的冲突性进行衡量,由于平均相关度越大越好,因此定义证据冲突度为
${\Delta }_{i}=\frac{max\left({R}_{i}^{*}\right)-{R}_{i}^{*}}{max\left({R}_{i}^{*}\right)-min\left({R}_{i}^{*}\right)}    1\le i\le N$
Δi的范围为[0,1],其值越大,说明证据mi与其他证据的冲突性越高。
参数$\tau $表示对高冲突证据的容忍度。当$\tau =0$时,只有证据信息之间完全正相关时,才不会被判定为高冲突证据;当$\tau =1$时,只有证据信息之间完全负相关时,才会被判定为高冲突证据。建议$\tau $值设置在0.6到0.9之间。本文中$\tau =0.75$,当${\Delta }_{i}\tau $,判定mi为冲突证据。
4)定义证据mi的可信度为
$Cr{d}_{i}={R}_{i}^{*}/\sum _{i=1}^{N}{R}_{i}^{*}$
5)为保证证据信息的和为1,增加证据信息Θ,非冲突证据的Θ值为0,将冲突证据mi修改为
${m}_{i}^{\text{'}}\left({A}_{k}\right)=\left\{\begin{array}{ll}Cr{d}_{i}\cdot {m}_{i}\left({A}_{k}\right)& {A}_{k}\ne \Theta \\ 1-\sum _{k=1}^{n}Cr{d}_{i}\cdot {m}_{i}\left({A}_{k}\right)& {A}_{k}=\Theta \end{array}\right.$
对证据信息经过上述操作后,再代入式(11)中进行信息融合操作。
构建如图1所示的变压状态评价体系,并对其涉及的指标数据进行采集。
建立评语集V={v1v2v3v4},其中v1v2v3v4分别代表变压器的正常状态、注意状态、异常状态和严重状态。
确定指标权重W。分别计算基于层次分析法的主观权重和基于Critic方法的客观权重,基于博弈论进行组合赋权,求得组合权重。
构建各层次模糊评判矩阵。将评价指标原始数据转为相对劣化度,再使用云模型求得对于4种状态的隶属度,从而得到评判矩阵Ri
因为变压状态评价体系为多层结构,先求得项目层的评估向量Mi=Wi×Ri,再利用改进后的D-S证据理论对项目层的各个评估向量进行融合,最后求得目标层的评估向量M,取评估向量的最大分量作为状态评价结果。
为了验证本文方法的有效性,对文献[31]中所提到的某变电站110 kV一号主变的实验数据进行验证。
参考文献[31]中的主观权重m1,基于文献[32]中各台变压器的状态指标数据通过Critic方法计算客观权重m2,采用博弈论进行权重融合得到的组合权重m,如表5所示。并对油中溶解气体指标权重、电气试验指标权重、绝缘油试验指标权重分别归一化后得到W1为[0.168 6,0.288 6,0.222 1,0.320 7],W2为[0.231 1,0.206 4,0.337 8,0.224 7],W3为[0.323 1,0.45 2,0.224 9]。
参考文献[31]中的指标相对劣化度D为[0.17,0.000 3,0.48,0.43,0.768,0.272 5,0.23,1.00,0.40,0.362 5,0.375],使用云模型将D转换为对于4种变压器状态的隶属度,各指标的隶属度如表6所示。
表6中评价指标隶属度数据按照所属项目不同,可得评判矩阵R1=[I1I2I3I4]TR2=[I5I6I7I8]TR3=[I9I10I11]T
Mi=Wi×Ri可得项目层隶属度M1M2 M3,如表7所示。使用原D-S证据理论对M1M2 M3进行融合,结果如表7所示。
经过式(12)~式(16)对M1M2M3冲突性进行判断,其中M1为冲突性数据,并将M1M2M3修正为M1*M2*M3* ,如表8所示。
使用式(11)对M1*M2*M3*进行数据融合,结果为[0,0,0.898 6,0.101 4,0],因此判定变压器状态为注意,相较于文献[31]中的结果[0.194 0,0.575 9,0.113 2,0.117 0],本文结果更加确切。
为了更好验证本文方法的有效性,从安徽某地区收集了50台550 kV变压器的在线数据和试验数据,其中包括18台正常状态的变压器、15台注意状态的变压器、10台异常状态的变压器、7台严重状态的变压器。通过模糊综合评价法、文献[30]和本文方法对50台变压器状态进行评价,评价结果如表9所示。
模糊综合评价法采用层次分析法确定指标权重,使用岭型函数确定隶属度,准确率为78%。
文献[30]采用最优权重和D-S证据理论对传统方法进行改进,准确率为80%。
表9可知,采用本文方法得到的变压器状态评价结果中48台与实际状态一致。第15台和第28台变压器的状态评价结果与实际状态不同,但是在评估向量中二者概率相近,且评价结果更偏向较为严重的状态,能够降低潜在的安全风险。通过以上分析,本文方法的准确率为96%,能够较好地对变压器状态进行评价。
本文提出了一种基于权重融合和信息融合的变压器状态模糊综合评判方法。采用博弈论的方法克服主客观权重各自的片面性,使评价指标权重的确定更加合理;使用云模型代替隶属函数计算隶属度,兼顾模糊性和不确定性的优势;采用皮尔逊相关系数改进的D-S证据理论,解决高冲突证据信息融合结果与现实相悖的问题,有效地提高变压器运行状态评判的准确率。
在后续的研究中,将考虑把变压器的历史数据加入状态评价过程,以增加证据源数量,提高诊断精准度。
  • 国家电网有限公司总部管理科技项目(基于电网资源业务中台多模态数据的变压器状态感知与预测性运维技术研究与应用)(5700-202340289A-1-1-ZN)
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2025年第55卷第5期
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doi: 10.19457/j.1001-2095.dqcd25484
  • 接收时间:2023-11-13
  • 首发时间:2025-11-05
  • 出版时间:2025-05-20
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  • 收稿日期:2023-11-13
  • 修回日期:2023-12-31
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国家电网有限公司总部管理科技项目(基于电网资源业务中台多模态数据的变压器状态感知与预测性运维技术研究与应用)(5700-202340289A-1-1-ZN)
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    1 华北电力大学 计算机系,河北 保定 071003
    2 国网电力科学研究院有限公司,江苏 南京 210003
    3 国网安徽省电力有限公司超高压分公司,安徽 合肥 230041
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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